SN74LVC16245ADGGR Detailed explanation of pin function specifications and circuit principle instructions

The model SN74LVC16245ADGGR is a part of the Texas Instruments SN74LVC16245 family. This is a high-performance, low-voltage, 16-bit bidirectional bus transceiver designed for use with logic-level signals.

Packaging:

The SN74LVC16245ADGGR comes in a TSSOP (Thin Shrink Small Outline Package) with a 20-pin configuration. The device is commonly used in data bus systems and can be used for both transmitting and receiving data across buses. The full 16-bit data transfer allows for a wide range of applications.

Pin Function and Specifications:

Below is a detailed table of the pin function for the SN74LVC16245ADGGR in its 20-pin TSSOP configuration:

Pin Number Pin Name Pin Function Description 1 A1 Data input or output for bit 1 of the A bus (Bidirectional) 2 A2 Data input or output for bit 2 of the A bus (Bidirectional) 3 A3 Data input or output for bit 3 of the A bus (Bidirectional) 4 A4 Data input or output for bit 4 of the A bus (Bidirectional) 5 A5 Data input or output for bit 5 of the A bus (Bidirectional) 6 A6 Data input or output for bit 6 of the A bus (Bidirectional) 7 A7 Data input or output for bit 7 of the A bus (Bidirectional) 8 A8 Data input or output for bit 8 of the A bus (Bidirectional) 9 A9 Data input or output for bit 9 of the A bus (Bidirectional) 10 A10 Data input or output for bit 10 of the A bus (Bidirectional) 11 A11 Data input or output for bit 11 of the A bus (Bidirectional) 12 A12 Data input or output for bit 12 of the A bus (Bidirectional) 13 A13 Data input or output for bit 13 of the A bus (Bidirectional) 14 A14 Data input or output for bit 14 of the A bus (Bidirectional) 15 A15 Data input or output for bit 15 of the A bus (Bidirectional) 16 GND Ground pin (connect to ground of the system) 17 DIR Direction control pin (determines the data flow direction between A and B buses) 18 OE Output Enable pin (high to disable outputs, low to enable outputs) 19 B15 Data input or output for bit 15 of the B bus (Bidirectional) 20 B14 Data input or output for bit 14 of the B bus (Bidirectional)

Circuit Principle and Operation:

This device operates in a bidirectional manner, allowing data transfer between two buses, A and B, under the control of the DIR (Direction) and OE (Output Enable) pins.

When DIR is high, data flows from the A bus to the B bus. When DIR is low, data flows from the B bus to the A bus. The OE pin controls whether the output is enabled or disabled. If OE is high, the device outputs are disabled. If OE is low, the outputs are enabled and data transfer can occur.

The SN74LVC16245ADGGR is ideal for applications like parallel data transmission, bus switching, and data buffering in systems that use 3.3V or 5V logic levels.

FAQ (Frequently Asked Questions):

Q: What is the function of the DIR pin on SN74LVC16245ADGGR? A: The DIR pin determines the direction of data flow between the A and B buses. When DIR is high, data flows from the A bus to the B bus. When low, data flows from the B bus to the A bus. Q: How does the OE pin work in the SN74LVC16245ADGGR? A: The OE pin controls the output enable function. When OE is high, the outputs are disabled; when OE is low, the outputs are enabled for data transfer. Q: What is the maximum operating voltage for the SN74LVC16245ADGGR? A: The maximum supply voltage for the SN74LVC16245ADGGR is 5.5V. Q: Can the SN74LVC16245ADGGR be used with 3.3V logic? A: Yes, the device is compatible with both 5V and 3.3V logic levels. Q: What is the significance of the TSSOP package for the SN74LVC16245ADGGR? A: The TSSOP (Thin Shrink Small Outline Package) is a compact, surface-mount package ideal for high-density applications. Q: How does the SN74LVC16245ADGGR handle bidirectional data transfer? A: The device allows bidirectional data transfer through the A and B buses, controlled by the DIR and OE pins. Q: What is the current drive capability of the SN74LVC16245ADGGR? A: The device is capable of driving 24mA of current per pin, making it suitable for high-speed data transfer applications. Q: Can the device be used for level shifting between 5V and 3.3V systems? A: Yes, the SN74LVC16245ADGGR is often used for level shifting between 5V and 3.3V systems. Q: What are the logic levels for the A and B buses? A: The A and B buses operate at logic levels compatible with the supply voltage, either 3.3V or 5V.

Q: Is there a need for external pull-up or pull-down resistors with SN74LVC16245ADGGR?

A: Typically, external pull-up or pull-down resistors are not required for proper operation, as the device is designed to operate without them.

Q: How is the SN74LVC16245ADGGR used in a bus system?

A: The device acts as a transceiver, allowing data to flow between two buses in either direction, controlled by the DIR and OE pins.

Q: What is the typical propagation delay for the SN74LVC16245ADGGR?

A: The typical propagation delay is around 3ns, which ensures fast data transfer.

Q: Can this device be used in a high-speed clocked application?

A: Yes, the SN74LVC16245ADGGR is designed for high-speed data applications and can be used in clocked systems.

Q: What are the conditions for proper operation of the SN74LVC16245ADGGR?

A: Proper power supply voltages (3.3V to 5V) and correct pin connections for DIR and OE must be ensured for proper operation.

Q: Can the device be used for both input and output data?

A: Yes, the SN74LVC16245ADGGR is bidirectional, meaning it can be used for both input and output data.

Q: What is the thermal resistance of the TSSOP package?

A: The thermal resistance (junction to ambient) for the SN74LVC16245ADGGR is approximately 170°C/W.

Q: Is there an over-voltage protection feature in this device?

A: Yes, the SN74LVC16245ADGGR includes built-in protection against over-voltage conditions within its operating voltage range.

Q: What type of applications is the SN74LVC16245ADGGR suitable for?

A: The device is suitable for data bus systems, memory systems, parallel data transmission, and other applications requiring high-speed data transfer.

**Q: How should the *DIR* pin be set when not in use?**

A: When not actively controlling the direction, the DIR pin should be set to either high or low to define the default direction.

Q: What is the power dissipation for the SN74LVC16245ADGGR?

A: The typical power dissipation is very low, usually in the range of a few milliwatts during operation.

This detailed explanation provides both the pin functionality and practical application information for the SN74LVC16245ADGGR, including key circuit principles and answers to commonly asked questions.